Control mechanism for watch part

1. A control mechanism for timepiece of the type comprising a frame ( 10 ) furnished with two parallel faces defining a reference plane, one of which is intended to support a dial and the other is opposite the back, and, secured to this frame:

a control rod ( 12 ) furnished with an annular groove ( 14 ) having a width l, an external diameter D and an internal diameter d, mounted so as to move in translation on the frame ( 10 ) along a first axis (AA′) included in said plane, and

a retaining plate ( 20 ) mounted, on the back side, on the frame ( 10 ) parallel to said plane and comprising a locking piece ( 22 ) mounted so as to rotate about a second axis (BB′) perpendicular to the reference plane and arranged such that it is capable of occupying:

a first position, called the locking position, in which the translation movement of said rod ( 12 ) is limited by the engagement of the locking piece ( 22 ) in the groove ( 14 ), and

a second position, called the unlocking position, in which said locking piece ( 22 ) is no longer engaged in the groove ( 14 ) thus allowing the rod ( 12 ) to be pushed in on the frame ( 10 ) or pulled out,

characterized in that said locking piece ( 22 ) comprises:

a first part ( 26 ) of general cylindrical form, engaged in the retaining plate ( 20 ) in order to allow its rotation on the plate;

a second part ( 34 ) disposed on the side opposite to the rod ( 12 ) and arranged to allow said locking piece ( 22 ) to rotate, and

a third part ( 38 ), disposed on the side of the rod ( 12 ), intended to interact with it and comprising, for this purpose, two wings ( 40 ) inscribed in a dummy cylinder of the same axis as the second axis (BB′) and of slightly smaller diameter than the width l of the groove ( 14 ), said wings being arranged such that, in the locking position, the wings ( 40 ) are at least partly inscribed in the space between the external diameter D of the groove ( 14 ) and the internal diameter d and, in the unlocking position, the wings ( 40 ) take on the contour of the external diameter D.

2. The control mechanism as claimed in claim 1 , characterized in that the control rod ( 12 ) is a time-setting rod and in that the retaining plate ( 20 ) is a pull-out.

3. The control mechanism as claimed in claim 2 , characterized in that the pull-out ( 20 ) can move in translation.

4. The control mechanism as claimed in claim 2 , characterized in that the time-setting rod ( 12 ) terminates in a gear ( 16 ) which is integral therewith in rotation and in translation.

5. The control mechanism as claimed in claim 1 , characterized in that said locking piece ( 22 ) comprises positioning means ensuring that it is retained in the locked and unlocked positions.

6. The control mechanism as claimed in claim 5 , characterized in that said positioning means are formed by a frictional engagement of a part ( 26 ) of the locking piece ( 22 ) on the retaining plate ( 20 ).

7. The control mechanism as claimed in claim 5 , characterized in that said positioning means are formed by the wings ( 40 ) which extend on the sides of the groove ( 14 ) beyond its bottom, and whose free end takes on, in the locked position, the contour of the internal diameter d, in such a way as to define a notch engagement.

8. The control mechanism as claimed in claim 2 , characterized in that said locking piece ( 22 ) comprises positioning means ensuring that it is retained in the locked and unlocked positions.

9. The control mechanism as claimed in claim 3 , characterized in that said locking piece ( 22 ) comprises positioning means ensuring that it is retained in the locked and unlocked positions.

10. The control mechanism as claimed in claim 4 , characterized in that said locking piece ( 22 ) comprises positioning means ensuring that it is retained in the locked and unlocked positions.

11. The control mechanism as claimed in claim 8 , characterized in that said positioning means are formed by a frictional engagement of a part ( 26 ) of the locking piece ( 22 ) on the retaining plate ( 20 ).

12. The control mechanism as claimed in claim 9 , characterized in that said positioning means are formed by a frictional engagement of a part ( 26 ) of the locking piece ( 22 ) on the retaining plate ( 20 ).

13. The control mechanism as claimed in claim 10 , characterized in that said positioning means are formed by a frictional engagement of a part ( 26 ) of the locking piece ( 22 ) on the retaining plate ( 20 ).

14. The control mechanism as claimed in claim 8 , characterized in that said positioning means are formed by the wings ( 40 ) which extend on the sides of the groove ( 14 ) beyond its bottom, and whose free end espouses, in the locked position, the contour of the internal diameter d in such a way as to define a notch engagement.

15. The control mechanism as claimed in claim 9 , characterized in that said positioning means are formed by the wings ( 40 ) which extend on the sides of the groove ( 14 ) beyond its bottom, and whose free end takes on, in the locked position, the contour of the internal diameter d, in such a way as to define a notch engagement.

16. The control mechanism as claimed in claim 10 , characterized in that said positioning means are formed by the wings ( 40 ) which extend on the sides of the groove ( 14 ) beyond its bottom, and whose free end takes on, in the locked position, the contour of the internal diameter d, in such a way as to define a notch engagement.